# str="day day up"
# for i in range(len(str)):
#     print(str[i],end="")
#
# list1=[]
# # list1[0]=1
# # list1[1]=2
# list1.append(3)#添加元素
# list1.append(4)
# list1.append(5)
# print(list1)

# list2=[1,2,3]
# for i in list2:
#     print(i)
#     list2.insert(1,10)
#     print(list2)
#     list2.extend([11,12])
#     print(list2)
#     print("--------------------------")
#     # list2.sort(reverse=True)#默认升序/降序
#     # print(list2)
#
#     list3=sorted(list2)
#     print(list2)
#     print(list3)
#     del list3
#     print(list3)

# list4=[1,3,5,7,9]
#
# list5=[i for i in range(1,10) if i%2!=0]
# print(list5)

# str=('1111','2222')
# print(type(str))

